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PCF8574PW

In Stock: 4,080

8-bit 2.5- to 5.5-V I2C/SMBus I/O expander with interrupt

Manufacturers:
Texas Instruments, Inc
Mfr.Part#:
PCF8574PW
Datasheet:
PCF8574PW Datasheet (PDF)
Package/Case:
TSSOP20
Product Type:
Drivers
RoHS:
Lifecycle:
Active
EDA/CAD Models:
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PCF8574PW Information

Description

The Texas Instruments PCF8574PW is an I2C bus interface, an 8-bit programmable I/O expander that can be configured as inputs or outputs. It operates at a voltage range of 2.5V to 5.5V and sinks/sources up to 25mA per I/O pin. This versatile device offers flexible I/O expansion for industrial automation, home automation, consumer electronics, automotive applications, and controlling various peripherals like switches, relays, LEDs, LCDs, in embedded systems.

Features

The PCF8574PW features include:

I2C bus interface
8-bit programmable I/O ports with sink/source capability
Operates at 2.5V to 5.5V
Configurable as inputs or outputs
Sinks/source up to 25mA per I/O pin
Flexible I/O expansion for industrial automation, home automation, consumer electronics, and automotive applications

It is commonly used in controlling various peripherals like switches, relays, LEDs, LCDs, and more in embedded systems.

Package

The package type of PCF8574PW is Small Outline Packages - PW (R-PDSO-G20).

Pinout

According to the product information, the PCF8574PW has a package type of Small Outline Packages - PW (R-PDSO-G20), which indicates that it has 20 pins. As for its function, the PCF8574PW is an I/O expander with 8-bit programmable I/O ports. It can be configured as inputs or outputs and operates at 2.5V to 5.5V with sink/source capability up to 25mA per I/O pin.

Manufacturer

The manufacturer of the PCF8574PW is Texas Instruments (TI). Texas Instruments is a multinational semiconductor company that designs, manufactures, and tests semiconductors and other electronic components. The company was founded in 1930 and is headquartered in Dallas, Texas, USA. TI is one of the largest and most well-known semiconductor companies in the world, with a wide range of products including microprocessors, memory chips, and analog ICs.

Applications

According to the product information, the application areas of PCF8574PW include:

Industrial automation
Home automation
Consumer electronics
Automotive applications
Controlling various peripherals like switches, relays, LEDs, LCDs, and more in embedded systems

Equivalent

The equivalent products of PCF8574PW are:

NXP PCA8574
Microchip MCP23017
STMicroelectronics M24C64

These I2C bus interface ICs offer similar functionality, including 8-bit programmable I/O ports and sink/source capability.

Specifications

Category	Integrated Circuits (ICs)InterfaceI/O Expanders	Programmable	Not Verified
Number of I/O	8	Interface	I²C
Interrupt Output	Yes	Features	POR
Output Type	Push-Pull	Current - Output Source/Sink	1mA, 25mA
Clock Frequency	100 kHz	Voltage - Supply	2.5V ~ 6V
Operating Temperature	-40°C ~ 85°C	Mounting Type	Surface Mount
Base Product Number	PCF8574	Package/Case	TSSOP20

PCF8574PW FAQs

1.Q: Can the PCF8574PW operate in harsh environments?

A: It supports industrial temperature ranges (-40°C to +85°C) but lacks automotive-grade certification. Avoid exceeding absolute maximum ratings.

2.Q: How does the interrupt function work in the PCF8574PW?

A: The INT pin triggers when an input state changes, reducing the need for continuous polling. It resets when the host reads the I/O port via I2C.

3.Q: Are there related parts to the PCF8574PW for design flexibility?

A: Similar parts include the PCF8574A (expanded addressing) and other I2C I/O expanders like TCA9534 or PCA9534.

4.Q: What are the electrical characteristics of the PCF8574PW?

A: It has a quiescent current of 10 µA (max), sink current of 25 mA per I/O, and open-drain outputs with pull-up resistors required for logic-high states.

5.Q: What package type does the PCF8574PW use?

A: It uses a 20-pin TSSOP (R-PDSO-G20) package with gull-wing leads, measuring 6.6mm x 4.5mm x 1.05mm (max).

6.Q: Does the PCF8574PW comply with industry certification standards?

A: Yes, it is EU RoHS compliant. However, it does not meet Automotive or PPAP certifications.

7.Q: What are the recommended operating conditions for the PCF8574PW?

A: Operate at 2.5V to 6V supply voltage, within a temperature range of -40°C to +85°C. Ensure I2C communication adheres to Standard Mode (100 kHz).

8.Q: In which applications is the PCF8574PW commonly used?

A: It is used in industrial control systems, LCD/LED displays, sensor arrays, and general-purpose I/O expansion for microcontrollers in low-speed I2C environments.

9.Q: What are the key features of the PCF8574PW I/O expander?

A: Key features include 8-bit I/O ports, I2C interface (up to 100 kHz), open-drain outputs, interrupt capability, wide voltage range (2.5V–6V), and support for up to 8 addresses.

10.Q: What is the pinout configuration of the Texas Instruments PCF8574PW?

A: The PCF8574PW has a 20-pin TSSOP package with pins for I2C communication (SDA, SCL), interrupt output (INT), I/O ports (P0-P7), power (VDD), and ground (GND). Refer to the datasheet for the full pinout diagram.

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Ratings and Reviews

L

L**n
11/05/2021

10

Order received and it's already good!
M

M**n
09/02/2021

6

All the rules. Packing, quality.
J

J**n
07/07/2021

13

High quality led, recommended for application and purchase.
L

L**n
05/12/2021

2

Took with a margin, works well. I bet on the dho. Seller recommend

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